<!DOCTYPE html>
<title>Declarative Shadow DOM innerHTML</title>
<link rel='author' href='mailto:masonf@chromium.org'>
<link rel='help' href='https://github.com/whatwg/dom/issues/831'>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>

<body>
<script>
function myObserver(mutationsList) {
  for (let mutation of mutationsList) {
    if (Array.from(mutation.addedNodes).map(n=>n.id).includes('shadow')) {
      assert_unreached('For streaming declarative Shadow DOM, the <template> element should never get added to the tree');
    }
  }
  const host = document.querySelector('#host');
  if (!host)
    return;
  const shadow = host.shadowRoot;
  if (!shadow)
    return;
  const replaceNode = shadow.querySelector('#toreplace');
  assert_true(!!replaceNode);
  replaceNode.innerHTML = "<span id=newcontent>This should be in &lt;div>'s shadow root</span>";
  observer.disconnect();
}
var observer = new MutationObserver(myObserver);
observer.observe(document.body, { childList: true, subtree: true });
</script>

<div id=host>
  <template id=shadow shadowrootmode=open>
    <span id=toreplace><span id=oldcontent>This should get removed</span></span>
    <!-- Ensure observer runs at this point (https://github.com/web-platform-tests/wpt/issues/35393) -->
    <script> // some content, which shouldn't be necessary </script>
  </template>
</div>

<script>
test(t => {
  t.add_cleanup(function() { observer.disconnect(); });
  let host = document.querySelector('#host');
  let template = host.querySelector('template');
  assert_true(!template, 'Declarative shadow template should not be present');
  let shadowroot = host.shadowRoot;
  assert_true(!!shadowroot, 'Shadow root should be present');
  assert_true(!!shadowroot.querySelector('#newcontent'),'The innerHTML replacement content should be present');
  assert_true(!shadowroot.querySelector('#oldcontent'),'The old replaced content should not be present');
}, 'Declarative Shadow DOM: innerHTML should work while parsing streaming declarative shadow root <template>');
</script>
</body>
